/*
 * Copyright 2019 Ververica GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.ververica.sql_training.udfs;

import org.apache.flink.table.annotation.DataTypeHint;
import org.apache.flink.table.functions.ScalarFunction;
import org.apache.flink.types.Row;

import com.ververica.sql_training.udfs.util.GeoUtils;

/**
 * Table API / SQL Scalar UDF to convert a cell ID into a lon/lat pair.
 */
public class ToCoords extends ScalarFunction {

	@DataTypeHint("ROW<lon FLOAT, lat FLOAT>")
	public Row eval(Integer cellId) {
		return Row.of(
				GeoUtils.getGridCellCenterLon(cellId),
				GeoUtils.getGridCellCenterLat(cellId)
		);
	}
}
